Molding-machine.



E. H. MUMFGRD, DECD. R s. Mumfoan, Exscumx.

MOLDING MACHINE.

wmlcmlow FILED APR. al i915 Lhlu imma@ Aug. A1915.

2 SHEETS-SHEET l.

E, H. MUMFOHD, DECD.

R4 s. MUMFoso, ExEcuTmx.

MOLDING MACHINEl APPLICATION FILED APR. 8. 915- Lgvlz, Patented Aug. 24, 191;). l

2 SHEETS-SHEET 2.

rum

EDG-AR H. MUMFORD, OF PLAINFIELD, NEW JERSEY; ROSE SKEEL MUIS/[FORD EXEGUTRIX OF SAID EDGAR H. MUMFORD, DECEASED.

IVIOLDING-MACHINE.

lApplication filed April 8, 1915.

To all whom it may concern Be it known that l, EDGAR H. MUMFORD, a citizen of the United States, residing at Plainfield, in the county ofUnion and State of vNew Jersey, have invented certain new and useful improvements in Molding-lidachines, of which the following is a specification. A

rl`his invention relates to molding machines, and has for its primary object the provision of an improved molding machine which is a combined squeeze and jolt rammer, that is to say, the machine may be used for either a squeezing operation or a jolt ramming operation. One of the more specific objects of my invention is the provision of a machine having thecharacteristics specified, which is simple and compact in construction, in which the number of parts is reduced'to a minimum, and which is eilivcient l n operation. My invention also contemplates the provision of an improved apso constructed that it can, at will, be used either in carrying on a squeezing operation or a jolt ramming operation, and this in a very simple and expeditious manner without disturbing any of the mechanism. The foregoing, together with such other objects as may hereinafter appear or are incident to my invention, I attain by means of a construction which l have illustrated in pre-- ferred form in the accompanying drawings, wherein- Figure l is a front elevation and bpartial section of a molding machine embodying my invention; Fig. 2 is an enlarged sectional view of a portion of the apparatus shown in Fig. 1; Figs. 3 and l are respectively a. plan and sectional view of a detail of my apparatus, and Fig. 5 is a sectional view of a modified detail of the invention.

Referring to Figure 1, the machine comprises a hollow base 7 which forms a housing for the usual form of counterbalance means (not shown) 4and which-intermediate between its endsis provided with an upstanding cylindrical portion 8 and an upstanding` post or stationary plunger 9 which is disposed centrally within the cylinder 8. In the ends of the base 7 are mounted the shafts 10 which carry the swinging squeezer yoke B which .is adapted to be swung into and out of vertical .alinement with the molding machine proper, a stop 11 being pro- Specification of Letters Patent.

Patented Aumgd, 1915..

Serial No.'19,931.

vided to limit the movement ofthe yoke. The yoke 1s provided with the usual platen 1152, znd its functions will be readily unders oo Mounted in the cylinder 8 for vertical 60 States, No. 932,563, issued to me August 3l, 7'0

15.909, together with fluid plunger mecha-v nism 6 as shown in Let-ters Patent of the United States, No. 846,685, issued to me March 12,1907,.the operationofsuch correspondmgparts being the same as set forth in said Letters Patent.

Resting in the bottom of the cylinder 8 and beneath the lower face of the plunger 13 is a combined impact and valve member E Whichis a disk-like member composed of a layer of sheet leather'V 16 anda plate of sheet steel 17, preferably secured together by means of the rivets 18 v(see Figs. 3 ,and 4). The central opening 19 in the member E is of al size sufficient to permit the member E to mov-e freely on the post 9, as will-further appear.

' Fluid pressure from` any suitable source of supplyvis conducted to the cylinder 8 beneath the'member E by means of the pipe 90 2O and the port 21 which is formed in -the base 7 and opens into the interior of the cylinder 8 beneath the member E, the supply of pressure to the pipe 20 being governed by the valve mechanism 22 which may 95 be of any preferred type.

The operation ofthe apparatus thus far described is as follows. Upon the introduction of fluid pressure via the pipe 20 and port 21 into the cylinder 8, the fluid pressure 100 acts against the lower face of the member E and raises the said member, the plunger 13, the frame 15 and its associated parts, together with the flask carried thereby, toward the platen 12, thus effecting a squeezingv op-v eration. After the mold is squeezed, the fluid 'pressure is exhausted and the parts returned .to normal position, the stripping of the pattern being eected by the fluid pres sure mechanism 6 in the manner shown and 11G erbaut Mounted on the top of the plunger 65 describedY in Letters Patent No. 846,685, above referred to.

hlounted in the fluid pressure chamber 23 formed by the cylinder 14 and'plunger 9 is a valveblock 24 which is provided with a passageway 25, which communicates at one end with the chamber 23 and at the other end with a port 26v drilled in the postl 9 so as to communicate with the chamber 27 thereoffThe passageway 25 is controlled by the vertically movable valve 28 which is provided with a stem 29 which normally projects above the upper face of the valve block 24 in position to be engaged by a tappet 30 carried in the top of the cylinder 14. Formed in the wall of the cylinder 14 is an exhaust port 31 which, when the cylinder 14 is in lower position, is covered by the post 9, but which is uncovered and comes into register with the chamber 23 after the l cylinder 14 has traveled upward a predetermined distance. The cylinder 14 is spaced away from the frame 15 by means of the bosses 32 so asto provide lateral exhaust passages 33 at the top ofthe plunger 13 and cylinder14. A port 34 branches from the passageway 25 and extends beneaththe lowerface of the valve 2 8 to -control the pressure therebenea'th. Fluid pressure is 'introduced into the chamber 27 of the post 9 by means of the pipe 35' which extends from the main line 22a to a central point in the rear of the base 7 from which it extends into the recess 36 formed in the base 7. The 'pipe is controlled by an independent valve mechanism 37 The cperationof the apparatus when used as a jolt rammer is 'as follows. Upon the introduction of fluid pressure through the pipe'35, chamber 27, portl 26, and passageway 25, into theV fluid pressure chamber 23, the cylinder 14,toge ther with the plunger 13, is raised, the valve 28 remaining in open position as set forth in my co-pending appli= cation Serial No. 34,710, filed June 17, 1915. lVhen the cylinder 14 has moved upwardly a dista-'nce `sufficient to uncover the exhaust port 31, that is to say, when the exhaust port 31 registers with the chamber 23, the

l pressure in the chamber exhausts through the port 31 and exhaust passages 33, causing a sudden reduction of pressure in the chamber 23, as a result of which the valve 28 is moved upwardly to close the passageway 25 and cut ed further supply of fluid pressure by the pressure which has accumulated in the port 34 beneath the lower face of the valve@ The cylinder 14 and plunger 13, together with the parts associated therewith, fallby the action of gravity and impact upon the member E. As the parts lapproach lowermost position, the tappet 30 engages the stem 29 of the valve 28 and moves the valve to open position, thereby l again admitting fluid pressure through the been jolt rammed by the repeated impact j of the cylinder 14 and plunger 13 on the member E, the supply of fluid vpressure to: i

the pipe 35 is cut olf by closing the valve 37.

1t will be seen that when the machine is being used to carry on a jolt ramming operat1on, there 1s a tendency to draw a vacuum in the cylinder 8 below the plunger 13. To.

overcome thisA diiliculty, and to cause the machine to operate smoothly and efficiently, I provide a plurality of surge ports 38 in the bottom of the plunger 13 through whichv ,the air flows freely to opposite sides of the hollow plunger 13. It will be seen from lthe foregoing that the member E acts as a valve to close the surge ports 38 when the machine is being used for a squeezing operation,.and as an impact member against which the plunger 13 and cylinder 14 impact when the machine is being used for a jolt ramming operation. The sheet steel plate 17 acts as a stiening member holding the leather 16 in proper shape to prevent leakage during the operation ofthe machine.

.The fluid pressure plunger mecha'nism 6 is used-subsequently to the forming of a mold by either the squeezing operation or the jolt ramming operation described-to strip the mold from the pattern. The pattern carrier mechanism C carries the pattern as set fo'rth'in. Letters Patent, N o. 932,563, above referred to, and upon introduction of pressure into the plunger 6, the elevating frame Dv which carries the flask is raised relative to the pattern carrier mechanism and the pattern, thus stripping the mold free from the pattern.

It will' be readily seen that the mechanism is simple, compact and inexpensive in con` struction, and that it operates ina simple and eilicient manner, and that it can be used at will for a squeezing operation or a jolt ramming operation, to suit the 'character of the work on hand, without disturbing any of the mechanism in the slightest respect,

l the change in mode of operationbeing ac-l complished easily by manipulation of the.. valves respectively controlling the supply of ceA tion shown in Figure 5, in which the plunger is formed with a recess 39 in its lower' fac'e large enough to receive the member E? The plunger impacts therefore on the bottom of the cylinder, metal to metal.

'I claim:

1. A molding machine comprising in combination a cylinder having an internal upstanding post, a plunger in said cylinder having a cylindrical portion engaging said post, means for 'introducingfluid pressure into said cylinder for a squeezing operation, means for introducing fluid pressure into said cylindrical portion for a jolt ramming operation, and valve mechanism for controlling the supply of fluid pressure.

2. A molding machine comprising in comination a cylinder having an internal upstanding post, a plunger in said cylinder having a cylindrical portion engaging said post, means for introducing fluid pressure into said cylinder for a squeezing operation, means for introducing fluid pressure into said cylindrical portion for a jolt ramming operation, and valve mechanism for independently controlling the supply of presf sure for said cylinder and said cylindrical ortion.

3. A molding machine comprisingin combination a cylinder having an internal upstanding post, a plunger in said cylinder having a cylindrical portion engaging said post, means for introducing fluid pressure into said cylinder for a squeezing operation, means for introducing fluid pressure into said .cylindrical portion for a jolt ramming operation, and means for permitting a cir,- culation of air in the cylinder when the machine is operating as a jolt rammer.

4. A molding machine comprising in combination a cylinder having an internal upstanding post, a plunger in said cylinder' having a cylindrical portion engaging said post, means for introducing fluid pressure into said cylinder foi' a squeezing operation, means .for introducing fluid pressure into said cylindrical portion for a joltramming operation, and a circulation passage in the plunger permitting a flow of air in the cylinder when the machine is operating as a jolt rammer.

5. A molding machine comprising in combination a cylinder having an internal upst'a`nding post, a plunger in said cylinder having a cylindrical portion engaging said post, means for introducing fluid pressure into said cylinder for a squeezing operation, means for introducing fluid pres` sure into said cylindrical portion for a jolt ramming operation, a passage in the wall of the plunger to provide for circulation of the air in the cylinder When the machine is operating as a jolt rammer, and a valve member adapted to close said passage when the machine is operating as a squeezer.

6A A molding machine comprising in combination a cylinder having an internal upstanding post', a plunger in said cylinder having a cylindrical portion engaging said post, means Jfor introducing fluid pressure into said cylinder for a squeezing operation, means for introducing fluid pressure into said cylindrical portion for a jolt ramming operation, a passage in the Wall of the plunger to provide for circulation of the air in the cylinder when the machine is operating as a jolt rammer, and a valve member adapted to close said passage when the machine is operating as a squeezer and serving as an impact member when the machine is operating as a jolt rammer.

7. A -molding machine comprising in combination, a cylinder, va plunger therein, means for introducing fluid pressure into said cylinder to raise .the plunger for a squeezing operation, means for j olting said plunger for a jolt ramming operation, and a relief` passage for permitting free -iloW of air in the cylinder When the plunger is operating as a jolt rammer.

8. A molding machine comprising in combination, a cylinder, a plunger therein, means for introducing fluid pressure into said cylinder to raise the plunger for a squeezing operation, means for jolting said plunger for a .jolt ramming operation, a relief passa-ge for permitting free flow of air in the cylinder When the plunger is operating as a jolt rammer, and a valve member closing said passage upon introduction of pressure for the squeezing operation.

9. A molding machine comprising in combination, a cylinder, a plunger therein, means 'for introducing vfluid pressure into said cylinder to raise the plunger for a squeezing operation, means for jolting said plunger fora jolt ramming operation, a relief passage for permitting free flow of air in the cylinder when the plunger is operating as a jolt rammer, and a valve member'closing said passage upon introduction of pressure for the squeezing operation, said valve member acting as an impact member upon which the plunger impacts during the jolt ramming operation.

10. A molding machine comprising in combination, a cylinder, a plunger therein, means for introducing, fluid pressure into the cylinder beneath the plunger' to raise the latter, said plunger having a relief or surge passage, and a combined impact and valve member closing said passage upon introduction of pressure and receiving the impact of the plunger comprising a disklike flexible member and a distending means h'er, oneof said members having a cyiindrical portion and the other of said members having a plunger portion Working in said cylindrical portion, means for introducing pressure into said cylinder member for a squeezing operation, and means for introducing pressure into said cylindrical portion for a jolt ramming operation.

13. A combined squeeze and jolt ramming molding machine comprising in combination a cylinder provided With an .internal` post, a plunger in said cylinder provided With'a cylindrical portion engaging said post, means for introducing fluid pressure into the cylinder beneath the plunger, means Ier cylindrical portion, and means for breaking vacuum in the machine when it is being operated as a jolt rammer. l

lll. A molding machine comprising in combination, a cylinder, a plunger therein, means for raising the plunger for a squeezing operation, means or j olting said plunger for a jolt ramming operation, and a relief. means for permitting a free circulation ef air when the machine is operating as a jolt rammer.

In testimony whereof have hereunto signed my name.

EDGAR H. MUMFORD.

Sayles ci this patent may be obtained for tive cents each, by addressing the ommissiener of Patents,

` Washington, D. 0.

introducing Huid pressure into said 

